Is a resin kit better than a plastic kit?

That would really depend on your point of view.

If you are making a military model such as a tank for wargaming, resin kits have the bulk of the model already cast and it is just a case of adding the ancillary parts, whereas plastic models have to be built up using far more parts.

Resin kits are great if you want to use the model for the purpose of wargaming, they have great detail and it is more or less a case of just adding paint. If on the other hand you are making a railway coach or wagon there is slightly more work involved gluing parts together.

The advantage of using resin made kits on your layout is that they are much heavier than plastic and therefore sit on the track better and are less likely to derail due to their weight.

So, if you want to build a kit quickly and easily then resin is the way to go, but if like me, you like to build all the detail into your model and time is of little importance then plastic kits are the better option.

Obviously you also need to consider what is available: sometimes a kit is only available in plastic or in resin, so you do not always have a choice.

Please note that this is the opinion of a plastic kit modeller and opinions may vary depending on who you talk to.